Your Guide to the Solar System and the Night Sky
This site is free and ad-free thanks to the support of our users. If you can, please consider a donation.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:54  
clear_day Transit: 12:49  
SunsetSet: 18:43 south
sunny DaytimeWhat's Visible Now
All Constellations » Monoceros » 


Altitude: 33.8°   Azimuth: 193.5°   Direction: South-South-West

HR2731 is a double giant star in the constellation of Monoceros.

HR2731 visual magnitude is 5.75. Because of its reltive faintness, HR2731 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about HR2731:


HR2731 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 33.8°
Azimuth: 193.5°
Direction: South-South-West

Celestial coordinates and finder chart of HR2731

HR2731 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR2731 are provided in the following table:

07h 14m 11s
-03° 54’ 05”

The simplified sky map below shows the position of HR2731 in the sky:

Finder chart HR2731 star
Simplified finder chart for HR2731.

Visibility of HR2731 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's HR2731 rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 93.9°
Max altitude: 34.6°
Azimuth: 266.1°

Digitized Sky Survey image of HR2731

The image below is a photograph of HR2731 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of HR2731 is -0.015 arcsec per year in Right Ascension and 0.007 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR2731 star
DSS2 image of HR2731. The red arrow shows the motion of HR2731 during the next 10000 years (-2.50 arcmin in Right Ascension and 1.17 arcmin in declination);

Distance of HR2731 from the Sun and relative movement

HR2731 is distant 612.78 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

187.97 pc
612.78 ly
22 km/s
-0.015 arcsec/year
0.007 arcsec/year

Spectral properties of HR2731

HR2731 belongs to spectral class K5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR2731 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR2731. Attribution: Richard Powell / CC BY-SA

HR2731 star system properties

HR2731 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR2731 double sysyem:

2.7 arcsec

Alternative designations of HR2731